/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.python.util;

import org.apache.flink.api.common.functions.RichMapFunction;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.types.Row;

/**
 * {@link PartitionCustomTestMapFunction} is a dedicated MapFunction to make sure the specific field data is equal to
 * current sub-task index.
 */
public class PartitionCustomTestMapFunction extends RichMapFunction<Row, Row> {

	private int currentTaskIndex;

	@Override
	public void open(Configuration parameters) {
		this.currentTaskIndex = getRuntimeContext().getIndexOfThisSubtask();
	}

	@Override
	public Row map(Row value) throws Exception {
		int expectedPartitionIndex = (Integer) (value.getField(1)) % getRuntimeContext()
			.getNumberOfParallelSubtasks();
		if (expectedPartitionIndex != currentTaskIndex) {
			throw new RuntimeException(String.format("the data: Row<%s> was sent to the wrong partition[%d], " +
				"expected partition is [%d].", value.toString(), currentTaskIndex, expectedPartitionIndex));
		}
		return value;
	}
}
